iDP3420/3421/3423 User ’s Manual
9.3.2Electrical Characteristics
(1)Input signal level
All the input signals are at the TTL level. "HIGH" level : 2.0 V at minimum
"LOW" level : 0.8 V at maximum
(2)Output signal level
All the output signals are at the TTL level. "HIGH" level : 2.4 V at minimum
"LOW" level : 0.4 V at maximum
(3)Input and output conditions
All the input signals are pulled up at 3.3 kΩ.
[Printer Side] | [Host Side] |
Twisted 
Pair Wire
All the output signals are pulled up at 3.3kΩ.
[Printer Side] | [Host Side] |
Twisted
Pair Wire
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